t > critical value t, Ho is rejected

There is evidence that the mean concentration of the thioldiffers between the group. Paired t-testTwo methods of analysis are compared by applying both of them tothe same set of test materials, which contain different amounts ofanalyte.

Paracetamol concentration in tablets by two different methods. Tablets

from ten different batches. In addition to random measurement error, differences between the tablets and the differences between the methods may also contribute to the variation between measurement.